Abstract: In an access floor construction, service outlets (7), such as electrical sockets, are connected to a service supply accommodated in the underfloor space (5) by leads (9) extending through openings (8) in the edges of some of the removable panels which form the access floor. The removable panels with such openings can be interchanged with other panels and oriented so as to locate an opening (8) in a position close to a service outlet so as to permit the lead from the outlet to pass conveniently into the underfloor space (5) for connection to the service supply.

Abstract: A raised access floor construction comprises floor panels supported above a subfloor on spaced pedestal blocks upstanding from the subfloor. The pedestal blocks are maintained in predetermined positions by a base layer of thin sheeting material laid on the subfloor and having an array of pedestal block locating means formed on its upper surface in the predetermined positions and with which the pedestal blocks are engaged.